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प्रश्न
Write a note on coagulation of blood.
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उत्तर
- Clotting or coagulation is the process of converting the liquid blood into a solid form. This process may be initiated by contact of blood with any foreign surface (intrinsic process) or with damaged tissue (extrinsic process).
- Intrinsic and extrinsic processes involve interaction of various substances called clotting factors by a step wise or cascade mechanism.
- There are in all twelve clotting factors numbered as I to XIII (factor VI is not in active use). Interaction of these factors occurs in cascade manner leading to formation of the enzyme thrombin.
- Thromboplastin helps in the formation of enzyme prothrombinase. This enzyme inactivates heparin and it also converts inactive prothrombin into its active thrombin.
- Thrombin converts soluble blood protein fibrinogen into insoluble fibrin. Fibrin forms a mesh in which platelets and other blood cells are trapped to form the clot.
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संबंधित प्रश्न
The mineral ion needed for the formation of blood clot is :
A. Potassium
B. Sodium
C. Calcium
D. Iron
Explain the following:
Why is there no mixing of deoxygenated and oxygenated blood in the human heart normally?
Select the odd one in the following:
Monocytes, Lymphocytes, Basophils, RBC
Given below is a diagram of a smear of human blood. Study the same and answer the question that follow:
What is the life span of the part labeled "1"?
The diagram shows different types of blood cells, Name them.
A __________
B ______________
C ____________
D _______________
E ____________
F ____________
G ______________
H ______________
Name the Following
By which the human body is protected from invading bacteria.
Complete the following sentence with appropriate word:
The iron pigment __________ gives red colour to the blood.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
R.B.Cs are of several kinds whereas WBCs are of one kind.
______ is a loose-fitting membrane that encloses the heart and consists of a superficial fibrous layer and a deep serous layer.
Which of the following is/are TRUE regarding thrombocytes?
